Ugo Cavallero (20 September 1880 – 13 September 1943) was an Italian military commander before and during World War II. He was a recipient of the Knight's Cross of the Iron Cross, awarded by the Third Reich to recognise extreme battlefield bravery or successful military leadership.

In 1915, Cavallero was transferred to the Italian Supreme Command. A brilliant organizer and tactician, Cavallero became a Brigadier General and Chief of the Operations Office of the Italian Supreme Command in 1918. In this capacity, Cavallero was instrumental in forming plans that led to Italian victories at Piave and Vittorio Veneto during World War I. During his time as chief of the plan of Italian General Staff, he developed an antipathy with Pietro Badoglio, the Sottocapo di Stato Maggiore ( vice chief of the staff ) of the army.

Cavallero retired from the army in 1919 but later rejoined in 1925, at which time he became Benito Mussolini’s Undersecretary of War. A committed fascist, Cavallero was made a senator in 1926 and in 1927 became a major general. After leaving the army for a second time, Cavallero became involved in business and diplomatic enterprises throughout the late 1920s and early 1930s.

As Chief of the Italian Supreme Command, Cavallero worked closely with German Field MarshalAlbert Kesselring; he had a rather conflicting relationship with Field Marshal Erwin Rommel, whose advance into Egypt after his success at the Battle of Gazala he opposed, advocating instead the planned invasion of Malta; his opinion was however discounted. Under Cavallero’s leadership, Italy’s military forces continued to perform rather poorly during the war; nonetheless, he was promoted to Marshal of Italy in 1942 after the promotion of Rommel to Field Marshal (largely to prevent Rommel to claim rank before him). Despite having a good grasp on the problems inherent to the war in the Mediterranean that Italy had to fight, his acquiescence to Mussolini's views (for example his insistence on augmenting the Italian contingent fighting on the Eastern Front) led to a fatal dispersion of Italy's meager resources.

In January 1943, after the definitive loss of the African campaign and the setbacks suffered by the Italian Army in Russia, Cavallero was dismissed and replaced by General Vittorio Ambrosio. In response to Cavallero's dismissal, members of the Fascist leadership like Galeazzo Ciano, openly hostile to him, openly expressed their satisfaction.

After Mussolini’s government was toppled by the King, the newly appointed Prime MinisterPietro Badoglio ordered the arrest of Cavallero. In a document written in own defense, Cavallero claimed the merit of having opposed Mussolini and his regime. After the Armistice of Cassibile in September 1943, he was freed by the Germans, and was offered by Kesselring the command of the forming armed forces of the Italian Social Republic, but the finding of the letter led to some suspicions.

In the morning of 14 September 1943, he was found dead by a gunshot in the garden of a hotel in Frascati, after having dined and talked with Kesselring the night before; it is still up to debate whether he committed suicide or was assassinated by the Germans. It seems, however, that he firmly expressed his will to refuse collaborating with the Germans.